Telephone-transmitter



(No Model.)

H. EHRLIGH.

TELEPHONE TRANSMITTER.

No. 346,846. Patented Aug. 3, 1886.

INVENTOR .%a%(/ WITNES ATTo N. PET-ENS. Plmlomlhogmphen Wnsluingium a QNITED STATES PATENT OFFICE.

HERMAN EHRLICH, OF JERSEY CITY, NEYV JERSEY.

TELEPHON E-TRANSM ITTE R.

' SPECIFICATION forming part of Letters Patent No. 346,846; dated August3, 1886.

Application filed March 3], 1886. Serial No. 197,313. (Nomodeh) To aZZwhom itmay concern.-

Be it known that I, HERMAN EHRLIcH, of Jersey City, in the county ofHudson and State of New Jersey, have invented a new and ImprovedTelephone Transmitter, of which the following is a full, clear, andexact description.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, [O in which similar letters of reference indicatecorresponding parts in all the figures.

7 Figure 1 is a sectional elevation of my new and improved transmitter.Fig. 2 is a rear elevation of the mouthpiece and diaphragm;

I5 and Fig. 3 is a front view of the box, carbon, and centeringsprings,the mouth-piece and diaphragm being removed.

The invention will first be described in connection with the drawings,and then pointed out in the claims.

The box A and mouth-piece B are of the usual construction, and thediaphragm O is held between the box and mouth-piece in the usual manner.Upon the inner surface of the diaphragm is secured the button a,preferably cylindrical in form, and provided at its inner edge withseveral platinum points, b, for contact with the carbon d. Thecontactpoints are formed by soldering or otherwise securing small curvedplates of platinum to small projections formed on the edge of the buttona, and by the use of several points arranged in the same plane slightvibrations of the diaphragm will effect as perfect con tact asvibrations of considerable amplitude, so that both low and loud tones ofthe voice will be transmitted with equal distinctness. The carbon (Z isheld in the box A by three or more radially-arranged springs, ff. Theinner or adjacent ends of the springs are by preference connected to themetal disk 9, which is formed or provided with a screwstud, 'i, on whichthe carbon is placed. The outer ends of the springs are by preferenceattached to small bars a, which reach through apertures made in the boxA, and have small thumb nuts o placed upon them, by which the springsand the carbon may be adjusted so the latter may be easily brought toand held at the proper contiguity to the contact points I).

To prevent the carbon (Z from vibrating too sensitively from the motionof the diaphragm 0,1 place back of it, or rather back of the disk g,thecushion j,ofsoft rubber. Thisis attached to the inner end of the screwD, fitted in the back of the box A, so that by turning the screw thepressure or resistance of the cushion may be regulated-that is,increased or diminished; so the screw D and cushionjalso 6o serve asmeans for adjusting the carbon (1 to or from the contact-points b.

The line-wires P M are connected with the box A, in the usual manner, bythe bindingposts E and F, the latter of which is put in electricalconnection with the diaphragm O by the wire k, the former with thecarbon (1 by the wire Z, spring f, and disk g.

By constructing the transmitter as described a very delicate adjustmentof the carbon in position relatively to the contact-points b may beeasily eftected,'which is necessary to the efficiency of thetransmitter, and this adjustment may always be easily maintained, andthere is little danger of the parts getting out 7 of order. 1

Having thus described myinvention,what I claim as new, and desire tosecure by Letters Patent, is-

1. The electrode d,held in position by flexi- 8o ble connections withthe box, in combination with the cushion j and a support or holder forthe cushion, substantially as described.

2. The button a, attached to the diaphragm O, and provided with severalcontact-points, in combination with the electrode (1, held in positionby yielding connections with the box and backed with the cushion j, andadj ustingserew D, substantially as described.

HERMAN EHRLICH.

Vitnesses:

H. A. WEsT, O. SEDGWIcK.

